The Wind filter can be used to create motion blur, but it can
also be used as a general distort filter. What is characteristic
about this filter is that it will render thin black or white
lines. Wind will detect the edges in the image, and stretch out
thin white or black lines from that edge. This is why you can
create the illusion of motion, because the edges are what will
be blurred in a photograph of a moving object.
The interface is quite simple. You can set the
Strength of the wind and a
Threshold value. Threshold
will restrict the effect to fewer areas of the image.
Strength controls the amount of wind, so a high
value will render a storm. You can also increase the effect by setting
the Style to Blast, which will produce thicker
lines than Wind.
You can only set the wind in two directions, either Left or Right.
However, you can control which edge the wind will come from using the
values Leading, Trailing or Both. Because Trailing will produce a black
wind, it creates a less convincing motion blur than Leading, which will
produce white wind.
The following illustrations are based on this image:
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Preview
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All your setting changes will appear in the Preview without
affecting the image until you click on OK.
It reproduces a part of the image only, centred on the first
modified area it encounters.
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Style
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Direction
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You can select the direction, Left or
Right, from which the wind comes.
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Edge Affected
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Leading: Trails will start from the
front border, falling on the object itself. It suggests that
a violent wind is pulling color out.
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Trailing: Trails start from the back
border of the object.
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Both: Combines both effects.
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Threshold
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Threshold: The threshold to detect
borders. The higher it is, the fewer borders
will be detected.
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Strength
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Strength: Higher values increase the
strength of the effect.
